Droplet mobility on lubricant-impregnated surfaces
Droplet mobility on lubricant-impregnated surfaces
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DOI：
10.1039/c2sm27032c
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发表时间：
2013-01-01
期刊：
影响因子：
3.4
通讯作者：
Varanasi, Kripa K.
中科院分区：
文献类型：
--
作者：
Smith, J. David;Dhiman, Rajeev;Varanasi, Kripa K.
最近，与依赖稳定气液界面的超疏水表面相比，含有浸渍有润滑液的微米/纳米纹理的非湿润表面表现出优越的上级非湿润性能。在这里，我们研究的基本物理化学流体动力学时出现的液滴，不混溶的润滑剂，被放置在并允许沿沿着这些表面移动。我们发现，这些四相系统显示出新颖的接触线形态，包括一个有限的环形脊的润滑剂拉以上的表面纹理，因此多达三个不同的3相接触线。我们发现，这些不同的形态不仅支配的接触线钉扎，控制液滴的初始阻力的运动，但粘性耗散的水平，因此，一旦液滴开始移动，他们的滑动速度。
Non-wetting surfaces containing micro/nanotextures impregnated with lubricating liquids have recently been shown to exhibit superior non-wetting performance compared to superhydrophobic surfaces that rely on stable air-liquid interfaces. Here we examine the fundamental physico-chemical hydrodynamics that arise when droplets, immiscible with the lubricant, are placed on and allowed to move along these surfaces. We find that these four-phase systems show novel contact line morphology comprising a finite annular ridge of the lubricant pulled above the surface texture and consequently as many as three distinct 3-phase contact lines. We show that these distinct morphologies not only govern the contact line pinning that controls droplets' initial resistance to movement but also the level of viscous dissipation and hence their sliding velocity once the droplets begin to move.